ZFS patches.

[Xin LI]

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Xin LI wrote:
| Great work!
|
| For the record, this has fixed all of our known problem (multithread
| load causes panic, non-tuned loader.conf would be fragile on heavy load,
| etc) with ZFS as reported at the FreeBSD mailing lists or privately to
| Pawel, plus there is some performance improvements as compared with
| FreeBSD 7-STABLE (8-CURRENT with WITNESS, INVARIANTS off but userland
| malloc debugging options on).

One note: our test environment is amd64 with 8GB of RAM; the pool is
version 6.  We have not done 'zpool upgrade' as we want to share it
between 7.0-STABLE and 8-CURRENT for testing purposes.

Cheers,
- --
Xin LI <delphij at delphij.net>	http://www.delphij.net/
FreeBSD - The Power to Serve!
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